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feat(cli): add statement-log-file option
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| // Copyright 2019 ScyllaDB | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package stmtlogger | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "log" | ||
| "os" | ||
| "sync" | ||
| "sync/atomic" | ||
| "time" | ||
|
|
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| "github.com/pkg/errors" | ||
|
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| "github.com/scylladb/gemini/pkg/typedef" | ||
| ) | ||
|
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| const ( | ||
| defaultChanSize = 1000 | ||
| errorsOnFileLimit = 5 | ||
| ) | ||
|
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| type FileLogger struct { | ||
| fd *os.File | ||
| filename string | ||
| isFileNonOperational bool | ||
| mt sync.RWMutex | ||
| activeChannel atomic.Pointer[chan *typedef.Stmt] | ||
| channel chan *typedef.Stmt | ||
| } | ||
|
|
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| func (fl *FileLogger) LogStmt(stmt *typedef.Stmt) { | ||
| ch := fl.activeChannel.Load() | ||
| if ch != nil { | ||
| *ch <- stmt | ||
| } | ||
| } | ||
|
|
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| func (fl *FileLogger) Close() error { | ||
| return fl.fd.Close() | ||
| } | ||
|
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| func (fl *FileLogger) committer() { | ||
| defer func() { | ||
| fl.activeChannel.Swap(nil) | ||
| close(fl.channel) | ||
| }() | ||
|
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| errsAtRow := 0 | ||
|
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| for stmt := range fl.channel { | ||
| if fl.isFileNonOperational { | ||
| continue | ||
| } | ||
|
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| stmtStr := stmt.PrettyCQL() | ||
| _, err := fl.fd.Write([]byte(fmt.Sprintf("%s: %s;\n", time.Now().Format(time.RFC1123Z), stmtStr))) | ||
| if err == nil { | ||
| errsAtRow = 0 | ||
| continue | ||
| } | ||
|
|
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| if errors.Is(err, os.ErrClosed) { | ||
| fl.isFileNonOperational = true | ||
| return | ||
| } | ||
|
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| errsAtRow++ | ||
| if errsAtRow > errorsOnFileLimit { | ||
| fl.isFileNonOperational = true | ||
| } | ||
| log.Printf("failed to write to file %q: %s", fl.filename, err.Error()) | ||
| return | ||
| } | ||
| } | ||
|
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| func NewFileLogger(filename string) (*FileLogger, error) { | ||
| fd, err := os.OpenFile(filename, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0644) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| ch := make(chan *typedef.Stmt, defaultChanSize) | ||
|
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| out := &FileLogger{ | ||
| filename: filename, | ||
| fd: fd, | ||
| channel: ch, | ||
| } | ||
| out.activeChannel.Store(&ch) | ||
|
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| go out.committer() | ||
| return out, nil | ||
| } | ||
|
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| func drain(ch chan *typedef.Stmt) { | ||
| loop: | ||
| for { | ||
| select { | ||
| case <-ch: | ||
| default: | ||
| break loop | ||
| } | ||
| } | ||
| } | ||
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